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He, along with Paul Hill, Paddy Armstrong and Carole Richardson, spent 15 years in jail for the 1974 IRA bombing of the Horse and Groom pub in Guildford, Surrey.

Four soldiers and a civilian were killed and 65 people injured in - a crime they had nothing to do with.

His father Giuseppe, who was suffering from emphysema, was wrongly jailed for supposed bomb-making offences and died after five years behind bars.

Mr Adams said he had been in jail himself at the time they were imprisoned and it was believed an IRA unit known as the Balcombe Street gang had carried out the bombing.

The Sinn Féin leader rejected claims the IRA has any responsibility for miscarriages of justice linked to republican violence after former SDLP leader Seamus Mallon accused terror leaders of "almost conniving" with the British government to keep innocent people behind bars.

"I wonder what their consciences tell them now," Mr Mallon said on RTÉ's This Week yesterday.

Mr Adams dismissed the claim as political point-scoring: "The responsibility for the detention and incarceration of a range of people there, from the Guildford Four to the Birmingham Six and the Maguires, rests absolutely with the British establishment.

"The police there knew those individuals were not involved in those actions and there was a cover-up and that's a matter of public record."

Mr Adams said: "The IRA has to take responsibility for its own actions but let's not have Seamus Mallon try to score political points."

He praised comments from one of the Guildford Four, Paul Hill, who also rejected Mr Mallon's assessment.

Also speaking on the same programme, Mr Hill attacked successive Irish governments and the media for not supporting their campaign until they had spent more than a decade behind bars and said the Guildford Four suffered a greater miscarriage of justice than the people who were killed by the 1974 IRA bombings.

Mr Hill said people in positions of power did little for them and others whose lives were ruined.

"People knew we were completely and absolutely innocent. They should look in the mirror today and ask themselves 'What did I do for these individuals'," Mr Hill said.

The Guildford Four convictions were overturned in 1989. Along with the Birmingham Six, it is considered the worst miscarriage of justice in Britain.

In 2009 Mr Conlon wrote about the personal and emotional battles he suffered as a result of his incarceration and fight for freedom.

He suffered two breakdowns, attempted suicide and became addicted to drugs and alcohol following his release.

Mr Conlon began enduring nightmares after securing freedom.

"The ordeal has never left me," he said.

In July 2000 prime minister Tony Blair became the first senior politician to apologise to the Guildford Four.

The Balcombe Street gang, responsible for at least 16 murders during a 14-month terror campaign in south east England in the 1970s, is believed to have been responsible for the bombing.